I tested the Parking Spot at LAX a few weeks ago, but did not join their frequent parking program because I forgot to sign up prior to exiting the structure (will do that next time).

Overall, I was extremely pleased with the ease and convenience of getting to/from the terminal. Their shuttles run very often, unlike some of the other parking lot shuttles, and are spanking new, and thus very clean. They also give you a free bottle of water when you get on the shuttle (and get off, upon your return).

One thing I really liked about the Sepulveda structure at LAX (LAX has two Parking Spot locations) is that it's a big parking garage with an elevator, as opposed to a spread-out lot. I find this layout to be more convenient than the sprawl of LAX lots such as Park One, or LAX lots B & C.

Out of all of the LAX parking facilities I've used, I think the Parking Spot is the most user-friendly. They are a bit pricey (3 price categories: valet, covered parking & rooftop parking), but the convenience factor is worth a few extra dollars to me - which is where being a memboer of the Spot Club could really come in handy.